Find length of 2D array Python

Question

How do I find how many rows and columns are in a 2d array?

For example,

Input = ([[1, 2], [3, 4], [5, 6]])` 

should be displayed as 3 rows and 2 columns.

Answer 1

Like this:

numrows = len(input)    # 3 rows in your example numcols = len(input[0]) # 2 columns in your example 

Assuming that all the sublists have the same length (that is, it's not a jagged array).

Answer 2

You can use numpy.shape.

import numpy as np x = np.array([[1, 2],[3, 4],[5, 6]]) 

Result:

>>> x array([[1, 2],        [3, 4],        [5, 6]]) >>> np.shape(x) (3, 2) 

First value in the tuple is number rows = 3; second value in the tuple is number of columns = 2.